Adding .travis.yml to configure automatic tests via Travis CI (see http://travis-ci.org)

Travis will test agains PHP 5.3, 5.4 and 5.5.

refs #3721


git-svn-id: http://dev.piwik.org/svn/trunk@7826 59fd770c-687e-43c8-a1e3-f5a4ff64c105
 * not sure why now there are only 12 instead of 13 widgets
  * Simplifying other tests so that we can only update 1 widget count when a widget is added

git-svn-id: http://dev.piwik.org/svn/trunk@7827 59fd770c-687e-43c8-a1e3-f5a4ff64c105
Refs #3721 Removing test SVN keyword $Id$ test since GIT does not have this feature. 

NOTE: we probably should run a script to remove that line $Id$ from all php / js files in piwik...

git-svn-id: http://dev.piwik.org/svn/trunk@7828 59fd770c-687e-43c8-a1e3-f5a4ff64c105